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TDA7266P
3+3W Dual Bridge Amplifier
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TDA7266PJuly 2004
FEATURES TECHNOLOGY BI20II WIDE SUPPLY VOLTAGE RANGE (3.5 - 12V) OUTPUT POWER: 3+3W @THD = 10%, RL = 8Ω, VCC = 7.5V 4+4W Music Power @THD = 10%, RL = 8Ω,
VCC = 8.5V SINGLE SUPPLY MINIMUM EXTERNAL COMPONENTS: NO SVR CAPACITOR NO BOOTSTRAP NO BOUCHEROT CELLS INTERNALLY FIXED GAIN STAND-BY & MUTE FUNCTIONS SHORT CIRCUIT PROTECTION THERMAL OVERLOAD PROTECTION
DESCRIPTIONThe TDA7266P is a dual bridge amplifier specially
designed for LCD TV/Monitor, PC Motherboard, TV
and Portable Audio applications.
PRODUCT PREVIEW3+3W DUAL BRIDGE AMPLIFIER
Figure 2. Test and Application DiagramREV. 2
TDA7266P
Table 2. Absolute Maximum Ratings
Figure 3. Pin Connection (Top view)
Table 3. Themal Data
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TDA7266P(*) Measured on demoboard of figure 8 with gaussian noise signal which simulates Music/Speech programmes.
Table 4. Electrical Characteristcs (Refer to test circuit; VCC = 7.5V, RL = 8Ω, f = 1KHz, Tamb = 25°C unless otherwise specified)
TDA7266P APPLICATIVE SUGGESTIONS
3.1 STAND-BY AND MUTE FUNCTIONS
3.1.1 (A) Microprocessor ApplicationIn order to avoid annoying "Pop-Noise" during Turn-On/Off transients, it is necessary to guarantee the right St-
by and mute signals sequence.It is quite simple to obtain this function using a microprocessor (Fig. 4 and 5).
At first St-by signal (from µ P) goes high and the voltage across the St-by terminal (Pin 11) starts to increase
exponentially. The external RC network is intended to turn-on slowly the biasing circuits of the amplifier, this to
avoid "POP" and "CLICK" on the outputs.
When this voltage reaches the St-by threshold level, the amplifier is switched-on and the external capacitors in
series to the input terminals (C1, C3) start to charge.
It's necessary to mantain the mute signal low until the capacitors are fully charged, this to avoid that the device
goes in play mode causing a loud "Pop Noise" on the speakers.
A delay of 100-200ms between St-by and mute signals is suitable for a proper operation.
Figure 4. Microprocessor Application
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TDA7266P
Figure 5. Microprocessor Driving Signals
3.1.2 B) Low Cost ApplicationIn low cost applications where the µP is not present, the suggested circuit is shown in fig.6.
The St-by and mute terminals are tied together and they are connected to the supply line via an external voltage
divider.
The device is switched-on/off from the supply line and the external capacitor C4 is intended to delay the St-by
and mute threshold exceeding, avoiding "Popping" problems.
So to avoid any popping or clicking sond, it is important to clock:
Correct Sequence: At turn-ON, the Stand-by must be removed at first, then the Mute must be re-leased after a delay of about 100-200ms. On the contrary at turn-OFF the Mute must be activated
as first and then the Stand-by.
With the values suggested in the Application circuit the right operation is guaranteed.
Correct Threshold Voltages: In order to avoid that due to the spread in the internal thresholds (seethe above limits) a wrong external voltage causes uncertain commutations for the two functions we
suggest to use the following values:
Mute for Vcc>6.4V : VT = 2.3V
Mute for Vcc<6.4V : VT = Vcc/2 - 1
Stand-by : VT = 0.8V
TDA7266P
Figure 6. Stand-alone low-cost Application
Figure 7. Application Circuit
